<template>
    <div>
      <!--面包屑导航区域-->
      <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>参数列表</el-breadcrumb-item>
      </el-breadcrumb>
      <!--卡片视图区域-->
      <el-card>
        <!--警告区域-->
        <el-alert
          show-icon
          title="注意：只允许为第三级分类设置相关参数"
          type="warning"
         :closable="false">
        </el-alert>

        <!--选择商品分类区域-->
        <el-row class="cat_opt">
          <el-col>
            <span>选择商品分类：</span>
            <!--选择商品分类的级联选择框-->
            <el-cascader
              v-model="selectedCateKeys"
              :options="cateList"
              expandTrigger="hover"
              :props="cateProps"
              @change="handleChange"></el-cascader>
          </el-col>
        </el-row>
        <!--tab页签区域-->
        <el-tabs v-model="activeName" @tab-click="handleTabClick">
          <!--添加动态参数的面板-->
          <el-tab-pane label="动态参数" name="many">
            <!--添加参数的按钮-->
            <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
            <!--动态参数表格-->
            <el-table :data="manyTableData" border stripe>
              <el-table-column type="expand">
                <template slot-scope="scope">
                  <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">
                    {{item}}
                  </el-tag>
                  <!--输入的文本框-->
                  <el-input
                    class="input-new-tag"
                    v-if="scope.row.inputVisible"
                    v-model="scope.row.inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm">
                  </el-input>
                  <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                </template>
              </el-table-column>
              <el-table-column type="index"></el-table-column>
              <el-table-column label="参数名称" prop="attr_name"></el-table-column>
              <el-table-column label="操作">
                <template slot-scope="scope">
                  <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                  <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                </template>
              </el-table-column>
            </el-table>
          </el-tab-pane>
          <!--添加静态属性的面板-->
          <el-tab-pane label="静态属性" name="only">
            <!--添加属性的按钮-->
            <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
            <!--静态参数表格-->
            <el-table :data="onlyTableData" border stripe>
              <el-table-column type="expand">
                <template slot-scope="scope">
                  <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">
                    {{item}}
                  </el-tag>
                  <!--输入的文本框-->
                  <el-input
                    class="input-new-tag"
                    v-if="scope.row.inputVisible"
                    v-model="scope.row.inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm">
                  </el-input>
                  <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>

                </template>
              </el-table-column>
              <el-table-column type="index"></el-table-column>
              <el-table-column label="属性名称名称" prop="attr_name"></el-table-column>
              <el-table-column label="操作">
                <template slot-scope="scope">
                  <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                  <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                </template>
              </el-table-column>
            </el-table>
          </el-tab-pane>
        </el-tabs>
      </el-card>
      <!--添加参数的对话框-->
      <el-dialog
        :title="'添加' + titleText"
        :visible.sync="addDialogVisible"
        width="50%"
        @close="addDialogClosed">
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
          <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="addForm.attr_name"></el-input>
          </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
          <el-button @click="addDialogVisible = false">取 消</el-button>
          <el-button type="primary" @click="addParams">确 定</el-button>
        </span>
      </el-dialog>
      <!--修改参数对话框-->
      <el-dialog
        :title="'修改' + titleText"
        :visible.sync="editDialogVisible"
        width="50%"
        @close="editDialogClosed">
        <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
          <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="editForm.attr_name"></el-input>
          </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
          <el-button @click="editDialogVisible = false">取 消</el-button>
          <el-button type="primary" @click="editParams">确 定</el-button>
        </span>
      </el-dialog>
    </div>
</template>

<script>
import request from 'api/request'

export default {
  name: 'Params',
  data () {
    return {
      // 商品分类列表
      cateList: [],
      // 级联选择器的配置对象
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      selectedCateKeys: [],
      // 被激活的页签的名称
      activeName: 'many',
      // 动态参数数据
      manyTableData: [],
      // 静态参数数据
      onlyTableData: [],
      // 控制添加对话框的显示与隐藏
      addDialogVisible: false,
      // 添加参数的表单数据对象
      addForm: {
        attr_name: ''
      },
      // 添加表单的验证规则对象
      addFormRules: {
        attr_name: [
          {required: true, message: '请输入分类名称', trigger: 'blur'},
        ]
      },
      // 修改表单的显示与隐藏
      editDialogVisible: false,
      // 修改表单的数据对象
      editForm: {

      },
      // 修改表单的验证规则
      editFormRules: {
        attr_name: [
          {required: true, message: '请输入分类名称', trigger: 'blur'},
        ]
      }
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    // 获取所有的商品分类列表
    async getCateList () {
      const {data:res} = await request('categories')
      if(res.meta.status !== 200) {
        return this.$message.error('获取商品分类列表失败！')
      }
      this.cateList = res.data
    },
    handleChange () {
      this.getParamsData()
    },
    // tab页签点击事件的处理函数
    handleTabClick () {
      this.getParamsData()
    },
    async getParamsData () {
      if(this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        this.$message.warning('注意：只允许为第三级分类设置相关参数')
        return
      }
      const {data:res} = await request(`categories/${this.cateId}/attributes`,{sel:this.activeName})
      if(res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败！')
      }
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        item.inputVisible = false
        item.inputValue = ''
      })
      if(this.activeName === 'many'){
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 监听添加对话框的关闭事件
    addDialogClosed () {
      this.$refs.addFormRef.resetFields()
    },
    // 点击按钮，添加参数
    addParams () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        const {data: res} = await request(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        }, 'post')
        if (res.meta.status !== 201) {
          return this.$message.error('添加参数失败！')
        }
        this.$message.success('添加参数成功！')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    async showEditDialog (attrId) {
      const {data:res} = await request(`categories/${this.cateId}/attributes/${attrId}`,{attr_sel:this.activeName})
      if(res.meta.status !== 200){
        return this.$message.error('获取参数信息失败！')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    editDialogClosed () {
      this.$refs.editFormRef.resetFields()
    },
    // 点击按钮修改参数信息
    editParams () {
      this.$refs.editFormRef.validate(async valid => {
        if(!valid) return
        const {data:res} = await request(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeName
        },'put')
        if(res.meta.status !== 200){
          return this.$message.error('修改参数失败！')
        }
        this.$message.success('修改参数成功！')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    async removeParams (attrId) {
      const confirmResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      // 用户取消了删除的操作
      if(confirmResult !== 'confirm'){
        return this.$message.error('已取消删除！')
      }
      // 删除的业务逻辑
      const {data:res} = await request(`categories/${this.cateId}/attributes/${attrId}`,{},'delete')
      if(res.meta.status !== 200) {
        return this.$message.error('删除参数失败！')
      }
      this.$message.success('删除参数成功！')
      this.getParamsData()
    },
    // 文本框失去焦点，或摁下enter都会触发
    async handleInputConfirm (row) {
      if(row.inputValue.trim().length === 0){
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      this.saveAttrVals(row)
    },
    async saveAttrVals (row) {
      const {data:res} = await request(`categories/${this.cateId}/attributes/${row.attr_id}`,{
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      },'put')
      if(res.meta.status !== 200) {
        return this.$message.error('修改参数项失败！')
      }
      this.$message.success('修改参数项成功！')
    },
    // 点击按钮，展示文本输入框
    showInput (row) {
      row.inputVisible = true
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 删除对应的参数可选项
    handleClose (i,row) {
      row.attr_vals.splice(i,1)
      this.saveAttrVals(row)
    }
  },
  computed: {
    // 如果按钮需要被禁用则返回true，否则返回false
    isBtnDisabled () {
      if(this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 当前选中的三级分类的id
    cateId () {
      if(this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    // 动态计算标题文本
    titleText () {
      if (this.activeName === 'many'){
        return '动态参数'
      }
      return '静态属性'
    },
  }
}
</script>

<style scoped lang="less">
  .cat_opt {
    margin: 15px 0;
  }

  .el-tag {
    margin: 10px;
  }

  .input-new-tag {
    width: 120px;
  }
</style>
